Method and circuit for driving liquid crystal display, and portable electronic device

a liquid crystal display and driving circuit technology, applied in the direction of electric digital data processing, instruments, computing, etc., can solve the problems of inability to obtain high-quality images, difficulty in color correction, and bottlenecks in reducing power consumption, so as to reduce power consumption in portable electronic devices, reduce packaging area on printed boards, and reduce power consumption.
US7046223B2Inactive Publication Date: 2006-05-16RENESAS ELECTRONICS CORP
25 Cites 27 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
RENESAS ELECTRONICS CORP
Publication Date
2006-05-16
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A method for driving a liquid crystal display capable of reducing power consumption, decreasing a packaging area or a number of packaged parts, and providing an image of high quality when the liquid crystal display having a comparatively small display screen is driven by a line inverting driving method or by a frame inverting driving method.Digital video data is output, with or without data being inverted, based on a polarity signal being inverted in every one horizontal sync period or in every one vertical sync period. A plurality of gray scale voltages is selected, being provided so as to have either of a voltage of positive or negative to match an applied voltage of positive polarity or negative polarity transmittance characteristic. Any one of the gray scale voltage out of the plurality of gray scale voltages having a selected polarity is selected based on digital video data, with or without inversion of a polarity of gray scale voltages. The selected one gray scale voltage is applied as a data signal to a corresponding data electrode.
Need to check novelty before this filing date? Find Prior Art

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a method and a driving circuit for driving a liquid crystal display (LCD), and portable electronic devices employing the driving circuit and more particularly to the method and the driving circuit for driving the LCD used as a display section having a comparatively small display screen of portable electronic devices such as a notebook computer, palm-size computer, pocket computer, personal digital assistance (PDA), portable cellular phone, personal handy-phone system (PHS) or a like and to the portable electronic devices equipped with such the driving circuit for the LCD.

[0003] The present application claims priority of Japanese Patent Application No.2001-008322 filed on Jan. 16,2000, which is hereby incorporated by reference.

[0004] 2. Description of the Related Art

[0005] FIG. 20 is a schematic block diagram for showing configurations of a driving circuit for a conventional color LCD 1. The...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More